Improvement in whiffletrees



LPABKER.

Whiihetraes.

N0. 144,786. f Pa-tented Nov.'.8, 1873.

AWITNELSUSJEs l I VE 0R- By MMM /I Attorneys UNITED STATES f PATENTOEEICE.

JOHN PARKER, OE PONTIAC, AssIGNOR OE ONEHALE HIs EIGHT To JAMES A.Homes, OF CATO, MICHIGAN.

IMPROVEMENT IN WHIFFLETREES.

Specification forming part of Leiters Patent No. 144,786, dated November18, 1873; application iiled September 9, 1873.

accompanying drawings forming part of thisv specilication, in which-Figure 1 is a top view of my improved whiflletree; and Fig. 2 is across-section of the same through line x x, Fig. l.

Similar letters of reference in the accompanying drawings denote thesame parts.

My invention relates to that class of whifletrees in which draft-chainsat the extremities of the whiflietree and a central draft'chain passingaround a roller are employed in lieu of single-trees; and it consists inconstructing the under surface of the central plate, through which theking-bolt for attaching the whiflietree to the tongue passes, with ashoulder, so that a less portionof the under surface of the plate willbe in contact with the tongue than in the ordinary construction, thusdispensing with much of the friction between the whiflletree and tonguein the vibrations of the former on the latter, and at thesame timeallowing the use of a smaller roller for the'central chain than in theordinary construction.

In the accompanying drawings, A is the whiletree,provided with plates oo at its .eX- tremities, to which are attached the draftchains C C. B isthe central plate, through a perforation in which a king-bolt passes forattaching the whifiletree to the tongue. The lower face, m, of the plateB rests upon the tongue, and is formed with a shoulder, n, in front ofthe whiffletree, instead of being made continuous, as in the ordinaryconstruction of this plate. By this construction I am enabled to avoidthe friction of the entire lower surface of the central plate upon thetongue, the

only'T friction arising being that between the surface on of the centralplate against the tongue. I am also enabled by this construction to usea smaller roller, D, for the central draft-chain E F than is used in thecentral plate, as ordinarily constructed, which renders the constructionlighter and equally as effective as the roller ordinarily employed. e eare Charing-plates on the rear side of the whiffletree opposite thefore-wheels, to protect the former from injury by the latter.

I claim as my invention- The whiffletree A, the central plate B nearlyencompassing the whiflietree, and having a shoulder, n, and the roller Dpivoted between .the ends of the plate, all combined substanially asdescribed, and for the purpose set Orth.

JOHN PARKER.

Witnesses: Jos. E. SAWYER, MELvILLE CHURCH.

